81360738 has 24 divisors (see below), whose sum is σ = 177573708. Its totient is φ = 26921472.

The previous prime is 81360733. The next prime is 81360739. The reversal of 81360738 is 83706318.

81360738 is a `hidden beast` number, since 8 + 13 + 607 + 38 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 77211369 + 4149369 = 8787^2 + 2037^2 .

It is not an unprimeable number, because it can be changed into a prime (81360733) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14031 + ... + 18962.

Almost surely, 2^81360738 is an apocalyptic number.

81360738 is an abundant number, since it is smaller than the sum of its proper divisors (96212970).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81360738 is a wasteful number, since it uses less digits than its factorization.

81360738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33138 (or 33135 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 81360738 is about 9020.0187361224. The cubic root of 81360738 is about 433.3162337763.

The spelling of 81360738 in words is "eighty-one million, three hundred sixty thousand, seven hundred thirty-eight".